fix(ios): Make NSCameraUsageDescription string non-empty, which is no…

…w rejected by Apple

When iOS 10 came out of beta, iTunes Connect started rejecting apps submitted with empty

NSCameraUsageDescription strings. This adds back a good default.

plugin.xml

@@ -38,7 +38,7 @@
     <header-file src="src/ios/QRScanner-Bridging-Header.h" />
     <source-file src="src/ios/QRScanner.swift"/>
     <config-file target="*-Info.plist" parent="NSCameraUsageDescription">
-      <string></string>
+      <string>The camera is used to scan QR codes.</string>
     </config-file>
   </platform>
 

readme.md

@@ -89,7 +89,7 @@ The iOS component of the plugin is written in Swift 2.3. To enable it, be sure y
 <platform name="ios">
     <hook type="before_build" src="plugins/cordova-plugin-qrscanner/scripts/swift-support.js" />
     <config-file target="*-Info.plist" parent="NSCameraUsageDescription">
-      <string>The camera is used to read QR codes.</string>
+      <string>The camera is used to scan QR codes.</string>
     </config-file>
 </platform>
 ```
@@ -102,7 +102,7 @@ npm install --save xcode
 
 Swift will now be enabled during your build, and the `QRScanner` plugin will be available in your app.
 
-Starting with iOS 10, the `NSCameraUsageDescription` string is also required to avoid a runtime exit. This field can be provided in a single language, localized using the `InfoPlist.strings` file, or simply left empty (`<string></string>`).
+Starting with iOS 10, a non-empty `NSCameraUsageDescription` string is also required to avoid a runtime exit. This field can be provided in a single language or localized using the `InfoPlist.strings` file. (Note: Apps with an empty `NSCameraUsageDescription` will not exit at runtime, but are rejected by iTunes Connect when uploaded for distribution.)
 
 #### Using multiple Cordova plugins written in Swift
 

tests/project/config.xml

@@ -26,7 +26,7 @@
         <allow-intent href="itms:*" />
         <allow-intent href="itms-apps:*" />
         <config-file target="*-Info.plist" parent="NSCameraUsageDescription">
-          <string>The test app uses the camera to read QR codes.</string>
+          <string>The test app uses the camera to scan QR codes.</string>
         </config-file>
     </platform>
     <plugin name="cordova-plugin-qrscanner" spec="../../cordova-plugin-qrscanner" />